18680546 has 4 divisors (see below), whose sum is σ = 28020822. Its totient is φ = 9340272.

The previous prime is 18680527. The next prime is 18680549. The reversal of 18680546 is 64508681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17850625 + 829921 = 4225^2 + 911^2 .

It is not an unprimeable number, because it can be changed into a prime (18680549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4670135 + ... + 4670138.

Almost surely, 2^18680546 is an apocalyptic number.

18680546 is a deficient number, since it is larger than the sum of its proper divisors (9340276).

18680546 is an equidigital number, since it uses as much as digits as its factorization.

18680546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9340275.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 18680546 is about 4322.0997212003. The cubic root of 18680546 is about 265.3362102637.

The spelling of 18680546 in words is "eighteen million, six hundred eighty thousand, five hundred forty-six".